He's just one guy. But Thatcher creates a full-band sound on his one-guitar arrangement of "Pinch Me" by the Barenaked Ladies <https://youtu.be/xSkUSRRzaj8>.
It's all here - rhythm guitar, lead guitar, bass, and drums.
How does he do it?
In all honesty, I don't know. But I am pretty certain that "Pinch Me" is Thatcher's best fingerstyle-and-vocal arrangement to date.